Last updated: February 24, 2025
In October, Portland experiences a dynamic shift in weather as autumn sets in. With maximum temperatures reaching a pleasant 21°C (71°F) and averaging around 12°C (54°F), the city enjoys mild days that gradually lead to cooler evenings, dipping to a minimum of 1°C (34°F). This month also witnesses a noteworthy precipitation amount of 163 mm (6.4 in) over approximately 13 days, contributing to the region's lush landscapes. An average humidity level of 78% adds a crispness to the air, making it an ideal time for both locals and visitors to appreciate Portland’s vibrant fall scenery.
As October rolls in, Portland experiences a noticeable shift in temperatures, signaling the arrival of fall. With minimum temperatures dipping to a brisk 1°C (34°F), it’s time for cozy sweaters and warm beverages. Daytime highs average around 12°C (54°F), reaching a comfortable 21°C (71°F) at their peak, making it a pleasant month for outdoor activities amidst the vibrant fall foliage. This transition from the warmth of September—where temperatures can still flirt with the high 20s—paves the way for more significant cooling as winter approaches. As the season progresses, Portlanders can savor the crisp air and the rich colors of autumn, all while preparing for the colder months ahead.
As October sets in, Portland experiences a significant surge in precipitation, with an impressive 163 mm (6.4 in) falling over 13 days. This marks one of the wettest months of the year, notably surpassing the amounts recorded in both the summer and early fall months. The arrival of autumn brings with it a shift in weather patterns, as the city transitions from the dry spells of August and September into the heavier, more consistent rains characteristic of the season. Comparatively, October's precipitation not only highlights a return to wetter conditions but also underscores the start of a pattern that continues into the winter months, preparing the landscape for the lush greenery that the Pacific Northwest is renowned for.
October in Portland brings a noticeable shift in humidity, with levels averaging 78%—a rise from the drier months of summer. This increase can be attributed to the arrival of autumn and the onset of wetter weather patterns. Throughout the year, Portland experiences its highest humidity in the winter months, peaking at 86% in January, while summer sees a dip, with July and August recording their lowest points at 67% and 66%, respectively. As fall progresses, humidity levels begin to climb once more, reflecting nature’s transition and setting the stage for Portland's signature rainy season. Thus, October serves as a pivotal point, showcasing a blend of lingering summer dryness and the approaching moisture that defines the Pacific Northwest.
In October, Portland experiences a moderate UV Index of 5, with an average burn time of 30 minutes, making it essential for sun seekers to stay mindful of their sun exposure. This marks a shift from the high UV levels observed in the summer months, yet it still encourages precautions, especially during midday. As the days get shorter and temperatures begin to drop, the UV Index decreases from its peak in May and June, reflecting a seasonal trend towards lower sun exposure. As autumn progresses, the importance of sunscreen and protective clothing remains relevant, despite the cooling weather. For a closer look at monthly trends and to stay informed, check out the detailed insights on Portland UV Index.
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As the vibrant summer days wane, October in Portland brings a gentle decline in sunshine, offering residents 216 hours of daylight. This marks a soft transition from the peak brightness of summer, where July and August bask in an impressive 333 and 336 hours respectively. The autumn month shows a notable decrease from September's 288 hours, indicating the gradual shift towards the winter months. With the crisp air and falling leaves, October invites both reflection and appreciation for the milder days ahead, while still providing ample sunlight for outdoor activities and autumn adventures. The trend of decreasing sunlight continues as we approach November, reinforcing the essence of this season of change in the Pacific Northwest.
In October, the likelihood of sunny weather in Portland stands at 37%, which is relatively consistent with the early fall months. Interestingly, this percentage marks a slight increase from the summer months and aligns closely with the sunniness observed in April and May. As we transition from September's 43% to October's figures, the gradual dip suggests shorter days and the onset of fall, yet it remains a favorable time for enjoying clear skies compared to the upcoming months — notably November, where the chance of sun jumps up to 54%. Overall, while October might not boast the highest chances of sunshine, it certainly holds its own within the seasonal tapestry of Portland's climate.
As autumn unfolds in Portland during October, the city experiences a noticeable reduction in daylight, with only 10 hours of sunlight each day. This marks a decline from the summer months, where daylight peaked at 15 hours in June and July, creating long, vibrant evenings. The gradual shortening of days starts as early as September, dropping to 12 hours, and continues its descent into October, echoing the rhythm of the changing seasons. As we approach winter, the trend downwards persists, with daylight reaching just 8 hours by December, reminding us of nature's cycle and the cozy, reflective moments that shorter days often inspire.
As October rolls into Portland, the air begins to shift, bringing an average wind speed of 4.2 m/s (9 mph) that hints at the changing seasons. This marks a slight uptick from the calm breezes of summer, with July and August recording their lowest speeds at just 3.4 m/s and 3.3 m/s respectively. The transition from the warm, still days of summer to the briskness of fall is palpable, as winds pick up momentum heading into November. Interestingly, October’s winds are reminiscent of those seen in the spring months, revealing a gentle oscillation in Portland's climate rhythm. Overall, the October winds offer a soft reminder of the approaching winter, maintaining a refreshing balance as the city enjoys its vibrant autumn hues.
The weather in Portland changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Portland and find detailed weather information for every month.
October and January exhibit starkly contrasting weather conditions. In October, temperatures range from a minimum of 1°C (34°F) to a maximum of 21°C (71°F), with an average of 12°C (54°F). The month typically sees around 163 mm (6.4 in) of precipitation over 13 days, accompanied by a humidity level of 78%. In contrast, January is considerably colder, with temperatures ranging from a frigid minimum of -19°C (-2°F) to a maximum of 12°C (54°F), averaging -2°C (28°F). Precipitation in January is lower at 97 mm (3.8 in) across 9 days, and the humidity is slightly higher at 86%. For more details on January weather, check Portland weather in January.
When comparing the weather in October and February, it's clear that these months offer starkly different climates. October experiences milder temperatures with an average of 12°C (54°F) and highs reaching up to 21°C (71°F), while February is much colder, featuring an average of -2°C (29°F) and a maximum of only 14°C (57°F). October also sees higher levels of precipitation, with 163 mm (6.4 in) over 13 days, compared to February's 103 mm (4.1 in) over just 10 days. Additionally, February tends to be more humid, with humidity levels at 84%, compared to October's 78%. For more detailed information, you can check Portland weather in February.
October's weather brings a noticeable warmth as temperatures range from a minimum of 1°C (34°F) to a maximum of 21°C (71°F), with an average of 12°C (54°F). In contrast, March typically experiences much colder conditions, with temperatures dipping as low as -15°C (6°F) and averaging around 1°C (34°F). While October receives more precipitation at 163 mm (6.4 in) over 13 days, March has less, totaling 91 mm (3.6 in) across 9 days. Both months exhibit high humidity, with October at 78% and March slightly higher at 82%. For a detailed look at March weather, visit Portland weather in March.
When comparing the weather in October and April, October generally presents milder overall temperatures, with averages around 12°C (54°F) and maximums reaching 21°C (71°F), making it a more temperate month. In contrast, April tends to be cooler with average temperatures around 6°C (43°F) and maximums of 18°C (65°F). Precipitation is fairly consistent in both months, with October receiving a bit more at 163 mm (6.4 in) compared to April's 149 mm (5.9 in), and both months experience precipitation on about 13 days. The humidity levels are quite similar as well, with October at 78% and April slightly higher at 80%. For more details on April weather, check out Portland weather in April.
October and May present contrasting weather patterns. In October, temperatures range from a chilly 1°C (34°F) at night to a mild 21°C (71°F) during the day, with an average of 12°C (54°F). This month is notably wetter, receiving 163 mm (6.4 in) of precipitation over approximately 13 days, contributing to a relatively high humidity level of 78%. In contrast, May offers slightly warmer temperatures, with a minimum of 2°C (36°F), an average of 11°C (52°F), and a maximum of 24°C (76°F). Precipitation is significantly lower, at 94 mm (3.7 in) across about 10 days, with humidity at a more comfortable 72%. For a deeper look at May's climate specifics, check out Portland weather in May.
In comparing October and June, one can observe a significant shift in temperature and precipitation. October experiences cooler weather, with average temperatures ranging from a chilly 1°C (34°F) at night to a pleasant 21°C (71°F) during the day, while June boasts milder temperatures with a minimum of 8°C (47°F) and a maximum of 28°C (83°F). Additionally, October is notably wetter, receiving 163 mm (6.4 in) of rain over 13 days, compared to June's 80 mm (3.2 in) over just 9 days. Humidity levels are slightly higher in October at 78%, while June has a comfortable 72%. For more detailed insights about June's weather, you can check Portland weather in June.
October and July present quite different weather experiences. In July, temperatures range from a comfortable minimum of 13°C (56°F) to a warm maximum of 28°C (83°F), with an average of 20°C (68°F) that encourages outdoor activities. In contrast, October sees much cooler conditions, with minimum temperatures dropping to 1°C (34°F) and maximums reaching only 21°C (71°F), creating an autumnal chill. Additionally, October is significantly wetter, receiving 163 mm (6.4 in) of precipitation over 13 days compared to July's 123 mm (4.9 in) over 12 days, making the latter a drier month. The humidity also contrasts, with July averaging 67%, while October is notably more humid at 78%. For more specific insights into July's weather, check out Portland weather in July.
October weather is characterized by much cooler temperatures compared to August. While August experiences a mild range with minimums around 14°C (57°F) and maximums peaking at 28°C (82°F), October sees temperatures dropping significantly, from a minimum of 1°C (34°F) up to a maximum of 21°C (71°F). Additionally, October is notably wetter, receiving 163 mm (6.4 in) of precipitation over 13 days, compared to August's more moderate 75 mm (3.0 in) spread across 9 days. The humidity in October is also higher at 78%, compared to August’s 66%. For a closer look at August conditions, you can explore Portland weather in August.
In comparing the weather between September and October, there is a noticeable shift in temperature and precipitation. October experiences cooler temperatures, with a minimum of 1°C (34°F) and an average of 12°C (54°F), while September boasts milder temperatures ranging from a minimum of 8°C (46°F) to an average of 17°C (63°F). Additionally, October sees significantly higher precipitation levels, accumulating 163 mm (6.4 in) over 13 days compared to September's 77 mm (3.0 in) during just 8 days. This increase in rain coincides with a rise in humidity, reaching 78% in October from 71% in September. For a closer look at September's weather trends, check Portland weather in September.
October weather features a mild range of temperatures, with a minimum of 1°C (34°F), an average of 12°C (54°F), and a maximum of 21°C (71°F). Despite the pleasant temperatures, it experiences significant rainfall, totaling 163 mm (6.4 in) over about 13 days, and maintains a humidity level of 78%. In contrast, November marks a shift towards colder conditions, with lower temperatures ranging from a minimum of -12°C (11°F) to an average of 5°C (42°F) and a maximum of 18°C (64°F). While November has slightly less precipitation at 130 mm (5.1 in) over 12 days, the humidity increases to 84%. This transition reflects a notable change in the weather as autumn progresses. For more detailed insights, you can visit Portland weather in November.
October and December offer contrasting weather experiences. In October, the temperatures range from a minimum of 1°C (34°F) to a pleasant maximum of 21°C (71°F), with an average of 12°C (54°F). The month sees considerable precipitation at 163 mm (6.4 in) over approximately 13 days, accompanied by a humidity level of 78%. In contrast, December brings colder temperatures, with a minimum of -18°C (-1°F) and a maximum of 13°C (57°F), leading to an average of around 0°C (33°F). Despite slightly lower precipitation at 144 mm (5.7 in) over 10 days, the humidity rises to 81%, contributing to a distinctly wintery feel. For more information on the weather specifics in December, check out Portland weather in December.
As October unfolds in Portland, it brings a refreshing shift from the warmer months, characterized by its crisp air and vibrant fall foliage. This month typically showcases a broader range of temperatures, with cooler nights contrasting the milder days, creating a delightful atmosphere. While the overall humidity level remains high, the frequent rainfall—averaging about 13 days—adds to the season's charm, allowing for a lush, colorful backdrop. This unique blend of weather patterns makes October a special time to experience Portland's natural beauty, setting it apart from the drier, warmer summer months. For a deeper understanding of the city's climate nuances, explore Portland Climate.